Rhododendron
Rhododendron
Rhododendron (/ˌroʊdəˈdɛndrən/; pl.: rhododendra) is a very large genus of about 1,024 species of woody plants and in the heath family (Ericaceae). They can be either evergreen or deciduous. Most species are native to eastern Asia and the Himalayan region, but smaller numbers occur elsewhere in Asia, and in North America, Europe and Australia.[5]
It is the national flower of Nepal, the state flower of Washington and West Virginia in the United States, the state flower of Nagaland and Himachal Pradesh in India, the provincial flower of Jeju Province in South Korea, the provincial flower of Jiangxi in China and the state tree of Sikkim and Uttarakhand in India. Most species have brightly colored flowers which bloom from late winter through to early summer.
Diseases Affecting Rhododendron
Phytophthora Root Rot and Crown Dieback
Fungus-like organisms belonging to the genus Phytophthora are soil- or plant-borne and all are plant pathogens.
Affected Species:
Botryosphaeria Canker
The fungus Botryosphaeria can cause a branch dieback on many woody ornamentals. Cankers girdle and kill twigs and branches of species such as horsechestnut, redbud, dogwood, beech, walnut, tulip poplar, sweetgum, crabapple, pine, oak, rhododendron, azalea, rose, willow, elm, and yew. Small black fungal fruiting structures which contain fungal spores develop in the canker.
Affected Species:
Azalea and Rhododoendron Diseases
Informational table showing disease name, symptoms, pathogen/cause, and management of Azalea and Rhododendron diseases.
Affected Species:
Insects Affecting Rhododendron
Rhododendron Borer
The rhododendron borer is one of the smallest clearwing borers found in Pennsylvania.
Affected Species:
Rhododendron Lace Bug
Twenty-eight lace bug species have been recorded in Pennsylvania, but only a few are key pests of ornamental evergreen plants like azalea and rhododendron.
Affected Species:
Rhododendron Tip Midge
The rhododendron tip midge is a light-brown, 1.25-mm-long fly.
Affected Species:
Southern Red Mite
The female adult is about 0.38 mm long and resembles a small spider.
Affected Species:
Whitefly
Whiteflies are white insects with pale yellow bodies that are approximately 2 mm long.
Affected Species:
Black Vine Weevil
The black vine weevil is a serious pest in nurseries and established landscape plantings.
Affected Species:
Azalea Bark Scale
The adult female azalea bark scale is dark red with short legs and antennae and long, sucking mouth-parts.
Affected Species:
Please give us a call if you have any questions about your trees and shrubs or would like to schedule an appointment for us to walk your property.
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